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Abstrak :
In 2020, renewable energy sources contribution in Indonesia’s energy production mix had only reached 14,71%. The percentage was still far from Indonesia’s renewable energy mix target of 23% in 2025 and 31% in 2050 according to their own national energy plan. To enhance their progress in reaching those targets, one way that can be done is to benefit promising renewable energy potential in many areas, including coastal area such as Muara Bungin Beach located in Pantai Bakti Village, Bekasi. The village mentioned before have an average of 3,26-5,41 m/s wind speed and solar radiation of 5-5,4 kWh/m2/day. To utilize the area’s potential, three units of The Sky Dancer TSD-500 wind turbine and two monocrystalline solar panels with a total capacity of 1800 Watt peak have been installed in that area since 2014, making Muara Bungin Village mostly known as Bungin Techno Village to public. Sadly, the wind turbines have been removed recently in October 2021 due to poor physical condition, and the solar panels rarely being used and maintenanced. A revitalization plan can be done to keep Bungin Techno Village’s existance in utilizing their renewable energy potential alive. ......The revitalization plan will create huge project, which is to install renewable energy power plants that can serve Desa Pantai Bakti’s electricity demand. A modelling result by LEAP shows that Desa Pantai Bakti’s electricity demand will reach 1.965,1 kWh/day in 2031. The planned renewable energy power plants will handle electricity load of 1.021,85 kWh/day or 51,6% from the village’s total electricity demand. A solar power plant consisting 104 units of Monocrystalline Maysun Solar Cell 500 Wp Peak Power with a lifetime of 25 years, a wind power plant consisting 24 units of 2000 W/220 V capacity wind turbines with a lifetime of 20 years, and a waste-to-energy power plant consisting a TG30 gasification machine and a 200 kVa/160 kW capacity diesel genset Caterpillar with a lifetime of 20 years. The total cost for lifetime operation of the planned solar, wind, and waste-to-energy power plant is estimated to be around Rp1.519.049.423; Rp3.238.231.499; and Rp859.733.884 respectively. The investment for the renewable energy technology revitalization plan can be considered economically worthy, judging by the NPV and ROR of every single planned power plants showing positive values or greater than zero.

Abstrak :
Water is one of the very necessary essence in human life aspects, which education is being one of them. As one of the best universities in Indonesia, University of Indonesia provides and find some ways to save clean water by minimizing the use amount of it, especially to reduce groundwater uses, as its noted in the UI GreenMetric purpose of clean water category. However, one of the faculties in UI, which is the Faculty of Nursing (FIK UI), have used a massive amount of groundwater in 2018 and 2019, with the amount number being 2.115.240 litres and 2.010.960 litres respectivel. FIK UI must find an alternative of water source other than groundwater, such as surface water. The purpose of this research is to design a water treatment system using the Agathis UI Lake water as the source to serve FIK UI need of clean water until 2042. The operation unit being the main focus of this designing process is the filtration using slow sand filter with silica sand and granular activated carbon as the filter medias, which both known effective to reduce iron, manganese, and fecal coliform concentration in raw water as the three parameters are important criterias in the Indonesias Health Minister Rule number 492 year 2010 about The Criterias of Drinking Water Quality. The amount of clean water need of FIK UI projected is 2,82 L/s. This design based on literatures and legal standards, especially in deciding the removal efficiency of the three parameters being said before of the slow sand filter. Based on the review of literatures, journals, and experiment results being done by others, the slow sand filter of this water treatment design can reach the removal efficiency of iron, manganese, and fecal coliform by 95,07%; 97,09%; and 99% respectively if the filter have 60 cm thick of silica sand above and 40 cm of granular activated carbon underneath the sand. One intake unit, two suction wells with two centrifugal pumps, one conveyance system, two slow sand filter units, one disinfection and reservoir unit, and two filter media cleaning units created to produce 3,8 L/s of clean water for FIK UI until 2042.